Soldering-iron.



J. L. NILSSON; SOLDERING IRON. APPLICATION FILED JUNE 6, 1910. 1,043,963. Patented Nov.12,1912.

INVENTUR WITNEEEEE ATTUR'NEY.

UNIT

STATES .PATENT onnion.

JOHAN L. NILSSON, F CHICAGO, ILLIOIS.

SLDEBINGQIRGN.

Specialization of Letters Patent.

Appiicaiion sie@ June s, isio. semi ne., .scaiaa l To all whom it 'may concern:

Be it known that I, JOHAN Lnnvio NiLssox, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Soldering-Irons, 0i which the following is a specification.

Mv invention relates to soldering irons- :ind'has particular reference to theelec-v trically heated type thereof. A

The .object of the invention is to provide an improved construction of interchangeable resistance coils or heat units which may be attached to and removed from the body of the tool in a simple quick and convenient manner, and whose size or dimensions are not limited by the size or dimensions of the body of the tool, so as to adapt the tool to different voltages of current; to provide 11n-` proved nieans for protecting the Joint be# tween the copper tip or nose and the'heat coil against damage by the soldering'acids; to facilitate separation andv adjustment of the different parts of the tool; to provide an improved contact betweenthe core of the heat coil and the tip; to reduce cost ofconstruction and obviate the necessity of removing interior parts in readjusting the tool for varying conditions of Service; to

provide a construction which does not neces sitate the displacement or disturbance o f the heat unit in exchanging tips; to provide a spring for the terminals far enough in the rear of points of contact with the heat coil to prevent damage thereto from the heatl of `the core and coil, and toA strengthen and improve the tool generally throughout.

With the above-named objects in view my invention consists in the new and improved construction, arrangement and combination of parts, hereinafter described in detail, illus.- trated in the accompanying drawing and particularly pointed out in the appended claims.

In the drawing-Figure 1 is a longitudinal section through a tool embodyingni invention. Fig. 2 is an enlarged view o the body of the tool broken awa and partly in section, core and tip slig tly separated.

Fig. 3 is a section on line it-A of Fig. 1. Fig. 4 is a section on line B-Bof Fig. 1.'

Fig. lSlis a section on line til/C of Fig. 1.-

Fig. 6 is a section on line D--D of Fig. 1.` Fig. 7 is a section yoir. line E -E of' 1. Fig. 8. is a section on line FF of Fig. 1.

- represents the tipor nose. This is held in a casing or tubular portion 3, the inner endof which is interiorly threaded at 4. 'These threads are engaged by Corresponding.s@l threads on the inner end of the tip, said inner end being thus well within the casing and removed from the working or taperedv portion br pointo the tip so as to protect the Joint from damage by the acids used in soldering. The same threads 4 are engaged bythreads on the forward end of a heatscore o on which the coil is wound. The coil 6 is incased by a shell 7 and between said shell and the core-windings coil is a layer of insulation 8. In the forward end of the core is a circumferential groove or channel 9 into which the shell 7 is spun as shown at.11 which makes an air and acid tight gunction between the core and shell and the spun oiset also lends additional strength to the heat unit comprising the core, lcoil-and shell. At its rear end the shell 'has a ,ref duced portion 10 which has interior thi' that engage exterior threads on therear 12 of the casing 7. The rear end reductie 10 of the shell 7 lends that end additions. strength and rigidity in the same manner the reduction 9 strengthens the forward end` The shell7, which incases the tip, extends to the tapered portion 13 of said tip and when the point 13 needs re-shaping it may he ground 'downitogether' with the forward end of the shell lwithout thereby interfering with the threaded connection between tip and core at 4e.

lward end of a stick, stem, or tube 15 which has threaded engagement with the rear end of the shell 7. The stem or tube 15 has a.

square or Octagon nut portion 16 immedi# ately in the rear of its threaded portion at 14. 0n the stem 15 is mounted a. handle 17 which is provided with a ferrule 18 which has a reduced' or nipple portion 19 that is tapered forwardly and split. at 9.0 so that it may be contracted on the stein., On the threaded portion 19 of the ierrule is mounted a nut provided with a tapend bore cori responding to the taper on the nipple and` having threaded engagement. with the latter.

Referringtin detailtto-the several this; nuisadvanced oirthe threaded porico heat at the contact .bore 32 in the rear end of t 35 tube 22 is placed a fiber 5o fixture-cord 43 and make 5'5 tion and damage to the tool.

' ings 44 and 5 6o the fiber plug an tion 19 same is .gradually contracted and clamped as tightly as ma be desired on the stem 15. By loosening t e n ut 21 the handle 17 may be adjusted toward or away from 5 the tip 2 to vary the working length-of the tool.

Within the stem 15 is a cylinder of lavite 22 4longitudinally through which extend bores 23 and 24 containing conductor wires 10 and 26..

'lhese bores are larger than the wires so as to permit lateral play of ilexing of said wires throughout a considerable distance of their len hs and prevent damage to their lexibi ity b reason of the or e ectrode ends 27 and 28 of said wires. The electrode or contact-end 27 is connected with one end of the coil 6 on which end is a ring 29 seated in a bore 30 of a lavite plug 31-held in a e cop er core 5. Said contact end 27 is in the orm of a segmental or laterally curved plate as is shown in Fig. 4. The ring 29 forms the terminus for one end of the coil, while a similar ring 33 inserted in a smaller bore 34,

forms the other end of the coil. The end of one of the stem wires is of spindle form as shown in Fig. 3 and connects with the ring 38. The end of the core winding or co1 30 which is connected with the ring 29 is indicated at 35, while the opposite end of the coil connecting with the ring 33 is indicated at 36 in Fig. 1.

At the handle, or rear, end of the lavite lug 37. On the ug is mounted a which protects and rear or Afree end of this ferrule or ring 38 strengthens 4the exposed end of the fiber plug and is made of larger diameter than 40 the plug so that the inner rim of the rin orlns a stop. The handle is counterbore l 39 so as to provide a recess in which t is rin or ferrule may move, and' the inner en of this counterbore or recess forms /a shoulder or stop 40 which serves as a stop to limit the outward ad'ustment of the handle 17 on the stem so at said handle may4 not be adjusted backwardly far enou h to expose the connections 41 and 42 o the it possible to accidentally short-circuit-the electrodeends 41 and 42 of the fixture cord and produce an arc by l 'ng the tool on some metallic substance. obviates accidental conlagra- The contact cord are fas- 26 by solderugh openings ite sides of mterce ting the bores containing the ends 41 ans 42, as shown most plainly in Fig. 7. Said stem wires 25 and 26 are fastened4 to the st em itself, or the .same fiber portion thereof, by means of ends 41 and 42 vof the fixture tened .to the stem wires 25 and poured thro `46 and 47 ext dln o5 similar soldar-ings, 48 and 49 into tip, means for engagin diametrically opposed openings 50 and 5l which extend into the bores 23 and 24.

The contact between the tip 2 and the core 5 is preferably made b flat, smooth surfaces on the adjacent en s of core and tip, the junction of the parts being indicated at 52. This makes it easy to slnoothen or sandpaper off the contacting surfaces and maintaln eflicient heat conductivity through the arts.

T e threads upon the threaded end of the core extend over the reduced or spun-down portion of the sleeve 4or core and coil casing 7, and a shoulder 7 is formed upon the coil casing or sleeve 7 against which the inner end of the shell or sleeve 3 may be tightly screwed. The solderin acids d0 not affect the shell surfaces o the joint formed at the shoulder as injuriously as it does copper surfaces.

At 9 and l1 pins are shown engaging the reduced' portion of the shell and the core to prevent accidental relative rotation when a wrench is applied to the shell or'coilcasin to unscrew the core from the tip.

I c aim as my invention- 1. In a solderin tool, the combination with the .tip and t e heat core, of a shell for sup orting said tip and core against each ot 1er, said shell having, at its end farthest removed from the point of said and holding said tip and core in contact with each other, whereby said shell serves as afcasing and support common to both tip and core and rotects the joint against exposure to the aclds used on said tip. i

2.- The combination with a solderin tool, of a heat unit consistin of a removab e section forming a art o the length of body of said tool, said) section comprisin a casing containing a core having a coi thereupon insulated from sa'id casing, said core having at its forward end a circumferential groove or channel into which said casing 1s spun, whereby said end is reduced to strengthen the casing and to form a substantlally inte al part of the core.

3. In a sol ering tool, the combination with the tip and its incasin shell, of a heat unit consistin of a casing orming a section of a body o the tool and containing a core and a coil, said core projectin out of the forward end of said casing an havin a circumferential groove at said end,- sai forward end of the casing being spun down into said groove to form a substantially integral part of said core and to provide a shoulder upon said casing said spun down portion of the casi and projecting portion of core havingxtgreads thereupon, said shell being interiorly threaded to engage the threads upon said casingrand core and to have its inner end screwed up closely lgainst' said shoulder.

4. In a soldering tool, the combination with a stem, and a grooved copper core having a resistance coil Wound thereupon, of an incasing shell for said core, said incasing shell being reduced at its ends and said reduced ends engaging both the groovein said core and said stem, respectively, whereby said core and stem are firmly bound together and the rigidity and strength of said shell increased, continuous threads upon said core and upon thereduced end engaging the core, a soldering tipor nose, and a shell or sleeve `having threads which engage the threaded fiber plug, the latter forming the outer end of sal'd stem, said stem having bores there` through, the wires Aextending through said cylinder and said bores, the latter being of larger diameter than said Wires to permit lateral movement of said Wires,vmeans for securing the Wires to the handle-end of the tool, and means for connecting said Wires with fixture-.cord wires.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses. v

JOHAN L. NILSSON.

Witnesses:

' M. C. ALLEN,

J. N, BEGKSTROM. 

